Bearing for weighing scales and the like



Nov. 12, 1935. E, G HED AN 2,021,061

BEARING FOR WEIGHING SCALES AND THE LIKE Original Filed Nov. 2, 1951 Patented Nov. 12, 1935 UNITED STATES PATENT OFFICE BEARING FOR WEIGHING SCALES AND THE LIKE 574,573. Divided and this application October 9, 1933, Serial No. 692,762

2 Claims.

This invention relates to certain new and useful improvements in pivots or bearings which have been designed more particularly for use in connection with weighing apparatus and like sensitive instruments, this application being a division of my copending application on Automatic weighing scale, Serial No. 574,573, filed November 12, 1931.

It is one of the objects of my invention to provide a knife-edge pivot or bearing, which,

while simple, compact and inexpensive in construction, is so designed as to be effectually held against lateral displacement and in true and proper alinement at all times, and which is practically dust, rust and dirt-proof and assures extreme accuracy in scale readings and in other instrumentalities to which it may be applied.

A further object of the invention is the provision of a fulcrum or pivot construction of this character whose elements are so constructed as to automatically adjust themselves to their true bearing position and wherein the friction between such elements is reduced to a minimum and is practically nil.

Other features of the invention reside in the structural arrangement of parts hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawing:-

Figure 1 is a cross section of my improved knife-edge pivot or bearing associated with a scale-beam or lever, and taken substantially in the plane of line l-l, Figure 2. Figure 2 is a top plan View of the bearing elements in operative relation. Figures 3 and 4 are detached perspective views of the rocking or movable bearing element and the fixed pivot element, respectively. Figure 5 is a cross section taken on line 55, Figure 2.

Similar characters of reference indicate corresponding parts throughout the several views.

By way of example, I have shown my knifeedge pivot or bearing in connection with a scalebeam or lever l0, although it is to be understood that the invention is applicable to other apparatus and mechanisms where accurate and sensitive pivot connections or fulcrums are desired.

The bearing or fulcrum is in the form of a knife-edge pivot preferably consisting of two members or bars II and I2 made from substantially flat or bar stock and disposed or mounted at substantially right angles to each other in simulation to the letter T, the bar I l constituting the upright or relatively fixed pivot member or element and the bar l2 constituting the rocking or movable bearing member or element which is disposedflcentrally over the adjoining edge of the companion bar. These bars are secured in any suitable manner to a support W and to 6 the pivoted element or lever Ill, respectively, and are interconnected with each other to permit a. free rocking action of the one relative to the other about a line or knife-edge contact while they are at the same time held against relative l0 displacement both lengthwise and crosswise of the bars. To this end, the pivot bar H is provided in its top edge with a plurality of notches I 3 which form resulting upstanding tongues i4 and I5. In the example shown in the drawing, 15 the bar I I is provided with the substantially central tongue l4 and the end tongues l5, the latter being provided with alining inclined or beveled bearing faces I6 inclined in one direction from one side edge to the opposite side edge of the 20 bar in the manner shown in Figures 1, 4, and 5. The intermediate tongue [4 has a similar beveled face I! inclined in the opposite direction to those of the tongues l5 and at substantially the same angle to the vertical and likewise extending from 25 one side edge to the opposite side edge of the box. The bottom edges l8 of the notches l3 are knife-like or V-shape and are formed by continuing the beveled faces l6 and I1 coextensively across the bottoms of the notches and lengthwise 30 of the bar in the manner shown in Figures 4 and 5, the resulting beveled faces 18 meeting in a line intersecting a plane passing substantially vertically through the longitudinal center of the bar ll.

The movable bearing member I2 is provided in one of its longitudinal edges with a central, laterally-facing notch l9 and in its opposite longitudinal edge with reversely-facing end notches 20 which are adapted to register or mate with the corresponding tongues l4 and 15, respectively, of the pivot bar I I. The bottom sides of the notches l9 and 29 of the bar [2 are in approximately longitudinal allnement and are located midway or centrally of the bar, as can be clearly seen in Figure 2. In the assembled position of the knifeedge pivot members, the bar l2 overlies the companion bar l and those bottom face-portions of the latter between the notches l9 and 2i! thereof 50 contact with the knife-edges N3 of the bar-notches l3, and the bottom corner edges of the barnotches l9 and 29 have alined contact with the corresponding reversely beveled faces I! and !6, respectively, of the bar ll, whereby a continuous 55 line or knife-edge fulcrum is provided between the combination with the linecontact between the. 7 bottom corners of the bar-notches I9, 29 and the oppositely-beveledfaces of the bar "H. It is to be understood that these pivot bars may be pro..

vicled with any number of intermeshing notches and grooves, depending on the length and size of the bearing fulcrum desired.

I claim as my invention:'

1. A knife edge pivot, comprising an upright pivot bar notched at its upper edge and having oppositely-inclined beveled faces along the same forming knife-like edges medially at the bottoms of said notches and alternately disposed beveled V faces adjoining them and extending from one side contacting'with the knife-like edges of said up right bar-notches and with the beveled faces adjoining them, respectively.

2. Ina knife-edge pivot, a pivot member having a plurality of longitudinally-spaced beveled faces inclinedjalternately in' opposite directions, and

upwardly-facing, substantially knife-like edges formed between saidbeveled faceswith their edges intersecting substantially medially thereof,

and a bearing disposed in overlying relation to said pivot member and having a plurality of oppositely-facing notchestherein, the lower edges of the notches contacting with the corresponding beveled edges of the pivot member and those face portions of the bearing between said notches contacting the knife-like edges of said pivot member.

' ERIK GUSTAF HEDMAN. 

